Reebok Defective Shoes and Exchange

I had bought a pair of Reebok shoes. I wore the shoes for just four days. Then the pasting of sole got removed. I went to the showroom and the executive at the store promised me to get the shoes replaced. He took my shoes and invoice and gave me a replacement slip. He told me that I will get the shoes replaced within fifteen days. But after two and half months I did not get the shoes replaced. I contacted the store personally and on phone many a times but in vein. This is not at all expected from a reputed company like Reebok.